These are not really the same size class, and that is the honest framing here. The Ultimate Ears Wonderboom 4 ranks #109 of 179 medium speakers by sound quality at $64.99; the Zealot S67 ranks #118 of 120 large speakers by sound quality at $70.94. Both are rated below 3.0/5 for their class (179 medium speakers and 120 large speakers), so if sound quality matters, look higher up the rankings.
The Ultimate Ears Wonderboom 4 is the lighter choice. A small, tough waterproof speaker with a strap loop and USB-C charging, easy to clip on a bag for outdoor trips. At 0.9 lbs (420 g) it weighs much less than the Zealot S67 at 5.3 lbs (2.4 kg). Watch for: Bass isn’t as deep as the top-ranked speakers and is a little thuddy.
The Zealot S67 is the longer-running choice. A budget waterproof speaker with a long rated battery, USB-C charging, microSD playback, and stereo pairing. It is rated for 20 hours of battery against 14 for the Ultimate Ears Wonderboom 4. It keeps a wired aux input, which the Ultimate Ears Wonderboom 4 lacks. It plays in stereo from a single unit, unlike the Ultimate Ears Wonderboom 4. Watch for: Sound quality is the catch.
Buy the Ultimate Ears Wonderboom 4 at $64.99 for a medium speaker, or the Zealot S67 at $70.94 for a large speaker instead.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Prices on this page were last checked November 7, 2026 at 7:34 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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Specifications Side By Side
| Ultimate Ears Wonderboom 4 | Zealot S67 | |
|---|---|---|
| Price | $64.99 | $70.94 |
| Ranked | #109 of 179 in Medium Size Portable Bluetooth Speakers | #118 of 120 in Large Size Portable Bluetooth Speakers |
| Battery Life | 14 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| Maximum SPL | 87dB (Manufacturer specified) | - |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | Yes | No |
| Weight | 0.9 lbs (420 g) | 5.3 lbs (2.4 kg) |
| IP Rating | IP67 | IPX6 |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.2 | 5.2 |
| Dimensions | 4.1” x 3.8” (104 x 95.3 mm) | 11.6” x 4.8” x 5.2” (294 x 122 x 132 mm) |
| Drivers | 2x 40mm active drivers + 2x passive radiators (46.1 x 65.2mm) | 60W: Dual drivers + passive radiator |
| TWS | Yes | Yes |
| Party Mode | No | No |
| App | No | No |
| EQ | No | No |
| Built-in Microphone | No | Yes |
| Power Bank | No | No |
| Aux Input | No | Yes |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC | SBC |
| Strap | Yes (built-in loop) | - |
| MicroSD Playback | - | Yes |
| Amplifier Power | - | 60W |
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